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Mixtures



Mixtures
Reading Level
     edHelper's suggested reading level:   grades 6 to 8
     Flesch-Kincaid grade level:   8.25

Vocabulary
     challenging words:    colloid, heterogeneous, homogeneous, solubility, solute, sieve, soluble, nitrogen, compounds, suspension, gravity, settling, mixture, bran, solution, solvent


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Mixtures
By Cindy Grigg
  

1     A mixture is a blend of two or more substances that have NOT combined chemically. A mixture can contain elements, compounds, or both, and in any amounts. In a mixture, each substance keeps its own properties. Substances in a mixture can be separated by physical means. Some different ways to separate the substances in a mixture are:

        1. Sorting by hand
        2. Shaking smaller particles through a sieve
        3. Settling out solid particles by letting the mixture stand
        4. Using a magnet to separate some metals out of a liquid
        5. Passing the substance through a filter paper
        6. Distilling to separate two liquids with different boiling points.
 
2     There are different kinds of mixtures. A heterogeneous mixture is a mixture in which the particles are not spread evenly throughout. Soil, raisin bran cereal, and fruit salad are heterogeneous mixtures.
 
3     A suspension is a heterogeneous mixture with particles large enough to be seen with the eye or a microscope. A suspension looks cloudy. The particles in a suspension are not dissolved; they will settle out from the force of gravity. Shaking or stirring will suspend the particles again. The particles can be separated out with filter paper. Examples of a suspension are orange juice with pulp or a salad dressing with oil, vinegar, and spices.

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